JPH06261A - Reciprocating type electric razor - Google Patents

Abstract

PURPOSE:To provide an electric razor ensuring a low noise and comfortable use by fitting a resonant absorber within a body. CONSTITUTION:Four resonant absorbers 5 are provided at both sides of a motor 8 within a body 4. Each of the resonant absorbers 5 is a Helmholtz resonator having divisions 16 to divide the inside of the body 4 and form cavity sections 5b at space with the inner wall of the body 4, and lids 17 having neck sections 5a. In this case, the resonance frequency (f) of each resonant absorber 5 is set at 2450Hz, and corresponds to the frequency of the highest level sound among sounds having various frequencies contained in a noise generated due to the reciprocating motion of an inner blade 2. According to this construction, a noise generated due to the reciprocation of the inner blade 2 is absorbed by the resonant absorbers 5. This is because the air in the neck sections 5a vibrates, upon incidence of a noise to the cavity sections 5b, and sound energy is converted to heat energy, due to the internal friction of the sections 5a and thereabout.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating electric shaver for handheld use.

[0002]

2. Description of the Related Art A conventional reciprocating electric shaver 110 shown in FIG. 5 has an outer blade 1 and an inner blade 2 slidably contacting an inner surface of the outer blade 1.
And a drive unit 3 that reciprocally drives the inner blade 2, and a main body 4 that houses the drive unit 3 therein. The outer cutter 1 is a thin steel plate having mesh-like whisker introduction holes. The inner blade 2 is formed by protruding a plurality of blade plates 2b on the upper portion of the base portion 2a in parallel at equal intervals. The lower part of the base portion 2a has an inner blade 2
Is fixed to the inner wall of the main body 4 via a link mechanism portion 2c that movably supports in the direction of arrow X. The drive unit 3 is a combination of a motor 8 and a crank mechanism unit 9.

[0003]

In the conventional reciprocating electric shaver 110, in order to reduce noise generated by reciprocating the inner blade 2, a counterweight (not shown) is provided in the crank mechanism portion 9. The vibration of the drive unit 3, which causes noise, is reduced by providing the same, and a sound absorbing material or the like is used for the housing of the motor 8. However, the sufficient effect was not obtained, and there was an unpleasant noise during use.

An object of the present invention is to provide an electric shaver which is less noisy and can be used comfortably.

[0005]

The reciprocating electric shaver of the present invention has a resonance type sound absorber provided in its main body.

[0006]

In the reciprocating electric shaver of the present invention, since the resonance type sound absorber is provided in the main body, the noise generated by reciprocating the inner blade can be absorbed by the resonance type sound absorber.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT As shown in FIG. 1, a reciprocating electric shaver 10 according to a first embodiment of the present invention comprises a motor 8 inside a main body 4.
Four resonance-type sound absorbers 5 are provided on both sides of the. The resonance type sound absorber 5 partitions the inside of the main body 4 and forms a cavity portion 5b between the partition plate 16 and the neck portion 5 of the main body 4.
A Helmholtz resonator comprising a lid 17 having a formed therein. The resonance frequency f of the resonance-type sound absorber 5 is set to 2450 Hz, and corresponds to the frequency of the largest sound among the sounds of various frequencies included in the noise generated by reciprocating the inner blade 2. The value of the resonance frequency f is the speed of sound c,
When the neck cross-sectional area A, the neck diameter d, the neck length L, and the cavity volume V are obtained, the following formula is obtained.

F = (c / 2π) {A / (L + 0.8d)} ^1/2 According to the reciprocating electric shaver 10 thus constructed, the noise generated by reciprocating the inner blade 2 resonates. Sound is absorbed by the mold sound absorber 5. This is because when noise generated by reciprocating the inner blade 2 is incident on the cavity 5b, the air in the neck 5a vibrates and the sound energy becomes thermal energy due to internal friction and frictional resistance around the neck 5a. This is because it changes to Therefore, as shown in FIG. 2, noise is reduced as compared with the conventional example, and it can be used comfortably. In addition,
Other configurations are similar to those of the conventional example.

As shown in FIG. 3, the reciprocating electric shaver 20 according to the second embodiment of the present invention is provided with a pair of resonance type sound absorbers 15 on the upper portion of the main body 4. Resonance type sound absorber 1
As shown in FIG. 4, reference numeral 5 is a box body in which a neck portion 15a is formed on the upper surface and the inside is a hollow portion 15b. The other configurations and effects are similar to those of the first embodiment.

[0010]

Since the reciprocating electric shaver of the present invention is provided with the resonance type sound absorber in the main body, the resonance type sound absorber can absorb the noise generated by reciprocally driving the inner blade. Therefore, noise is reduced and it can be used comfortably.

[Brief description of drawings]

1A is a longitudinal sectional view of a reciprocating electric shaver according to a first embodiment of the present invention, and FIG. 1B is a transverse sectional view thereof.

FIG. 2 is a noise characteristic diagram.

FIG. 3 is a cutaway perspective view of a reciprocating electric shaver according to a second embodiment of the present invention.

FIG. 4 is a sectional view of a resonance-type sound absorber.

FIG. 5 is a cutaway front view of a conventional reciprocating electric shaver.

[Explanation of symbols]

 4 Main body 5 Resonance type sound absorber

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Shin Kobayashi 1048, Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works, Ltd.

Claims (1)

[Claims] 1. A reciprocating electric shaver comprising an outer blade, an inner blade slidably contacting the inner surface of the outer blade, a drive unit for reciprocally driving the inner blade, and a main body accommodating the drive unit therein. A reciprocating electric razor, wherein the main body is provided with a resonance type sound absorber.